The C1-A59 from RD Microwaves is a Directional Coupler with Frequency 400 MHz to 2.9 GHz, Coupling 10 dB, Directivity 20 dB, Average Power 5 to 100 W, Insertion Loss 0.2 to 0.75 dB. Tags: Module with Connectors. More details for C1-A59 can be seen below.